Table 2 Performance comparison

Sensitivity % (95% CI)

6.2 (4.2–8.9)

50.9 (46.2–55.9)

Specificity % (95% CI)

99.8 (98.8–100)

74.9 (71.0–78.4)

Positive predictive value % (95% CI)

96.6 (80.4–99.8)

62.4 (57.2–67.3)

Negative predictive value % (95% CI)

56.5 (53.4–59.7)

65.1 (61.2–68.8)

Area under the ROC curve

0.53 (0.49–0.57)

0.63 (0.59–0.66)

Kappa

0.066*

0.262*